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(No Model.) 4 Sheets-Sheet I. E. B. OOXE & S. fiALMON.

MECHANISM FOR SCREENING GOAL.

No. 419,113. Patented Jan.7,1890.

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(No Model.)

B. B. GOXB & S. SALMON. MECHANISM FOR SCREENING GOAL. No. 419.113.Patented Jan. 7, 1890.

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(No Model.) 4 Sheets-Sheet 3. E. B. GOXE & S. SALMON. MECHANISM FORSCREENING GOAL.

No. 419,113. Patented Jan. 7, 1890.

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No. 419,113. Patented Jan.'7,1890.

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UNITE STATES PATENT OFFICE.

ECKLEY B. OOXE AND SAMUEL SALMON, OF DRIFTON, PENNSYLVANIA; SAID SALMONASSIGNOR TO SAID C-OXE.

MECHANISM FOR SCREENING COAL.

SPECIFICATION forming part of Letters Patent No. 419,113, dated January'7, 1890.

Application filed April 24:, 1889. Renewed December 16, 1889. serial No.333,840. (No model.)

T0 (0% whom, it may concern:

Be it known that we, ECKLEY B. COXE and SAMUEL SALMON, of Drifton, inthe county of Luzerne, and in the State of Pennsylvania, have invented.certain new and useful Improvements in Mechanism for Screening Coal; andwe do hereby declare that the following is a full, clear, and exactdescription thereof,

reference being had to the accompanying drawings, in which Figure 1 is aperspective view of our apparatus as arranged for use. Fig. 2 is a likeView of the bed-plate and operating-shafts separate from the screeningmechanism. Fig. 3 is a plan view of said bed-plate and shafts, theinterrupted and dotted lines showing different relative arrangements ofthe screening Fig. i is a side elevation of the central portion of thebed-plate, showing the operating-shafts. Fig. 5 is a side elevation ofthe apparatus complete, the full lines showing one position of thescreen-frames and the dotted lines another position of the same; andFig. 6 is a vertical section upon lines war of Fig. 8.

Letters of like name and kind refer tolikc parts in each of the figures.

Our invention is an improvement upon a coal-screening mechanism forwhich Letters Patent No. 380,190 were issued upon the 27th day of March,1888, in which mechanism a screen-holding frame was arranged to have agyratory motion in ahorizontal plane, and its weight was counterbalancedby means of a weight which was attached to or formed. upon theoperatingcrank.

The object of our present invention is to simplify the construction ofscreening mech anism by causing one of the operative parts tocounterbalance the weight of another operative part, and thus avoid thenecessity for weights which only perform the office of counter-balances;and to such end our said invention consists in an improved apparatus forscreening coal in which the parts are constructed and combined tooperate in the manner and for the purpose substantially as hereinaft-erspecified.

In the carrying of our invention into practice we employ a base A,which, as seen in Fi 3, has in plan view the general form of the letterH, and at each of its ends and at points at each side of itslongitudinal center is pro-v vided with circular bearings a and a, thatare each adapted to receive and furnish a path for a double-cone rollerB. At the 1011- gitudinal center of said frame and upon opposite sidesof its transverse center are journaled two vertical shafts G and 0, eachof which at points between its bearings a and a is provided with twoeccentrics c and c, that are arranged directly opposite to each other,as shown. Said shafts are connected with each other and with drivingmechanism at points above or below said base, as may be most convenient,and are relatively arranged so that they shall revolve in the samedirection and time, and the upper and lower eccentrics of one shaftshall rotate in exact unison with the corresponding eccentrics of theother shaft.

The base A and rollers B and B are intended for the support of twoscreen-frames D and D, each of which has a general rectangular shape inplan view and in horizontal size corresponds substantially to thedimensions of said base at one side of its longitudinal center, both ofsaid parts in such respect being adapted to the required capacity of theapparatus.

Upon the lower side of each frame D, at or near the corners of the same,are secured cylindrical bearings E and E, which at their lower endscorrespond to the bearings a and a of the base A, and are adapted torest upon and travel over and around the upper ends of the cone-rollersB and B, the arrangement being such as to enable said screen-frame to begyrated horizontally, during which operation the lower halves of saidrollers roll around said bearings a and a and said bearings E and E rollupon and around the upper halves of said rollers.

The bearingsE and E of each screen-frame have such relative heights asto cause said screen to have a downward inclination toward the end or toeither side of the base, as desired, while each frame is provided.interiorly with such number and character of screens 7 d and d as willadapt it for the work to be specified.

done.

Each screen-frame D is connected with the corresponding eccentrics c andc or c and c of the shafts C and C by means of straps d and (1', each ofwhich is attached to said frame at a point adjacent to said eccentrics,and from thence extends outward to and around the same.

If now the operating-shafts are caused to rotate simultaneously incorresponding time and in the same direction, the screenfframes will begiven a 'gyratory motion upon their rollers in relatively-oppositedirections, so that the centrifugal force of one frame will be exactlycounterbalanced by the centrifugal f r e. f th pp i r m nd he result w ln en ire f eedom from vib a o s that the mechanism will run steadilyupon any foundation which is capable of sustaining its weight. By thuscausing the operati P rt t c nt rbalance eaoh ot r e e h c st, an b lk oth meehani m a e ma e ia y les than i ld ot ise b practicable to secure,while from the exceeding y ompee or of the pparatus its oap y for gi nsi e and e ght i v ry arg Ha ing thus es r be o r eh mwha we claim is.+

1- .As n mp v m n n mee a sm f screening coal, two screen holding frameswhich are each adapted to have a gyrator-y motion in a horizontal plane,in combination with driving mechanism that operates to gyrate saidframes in relatively-opposite directions, substantially as and for thepurpose 2. As an improvement in mechanism for screening coal, two screen:holding frames that rest upon and are supported by doublecone rollersand are adapted to have a gyratory motion in a horizontal plane, incombination with driving mechanism which operates to simultaneouslygyrate said frames in relativelysopposite directions, substantially asand for the purpose shown.

3. As an improvement in mechanism for screening coal, two screen-holding frames which are each adapted to have a gyratory motion in ahorizontal plane, in combination with two shafts that are journaledvertically between said frames and are provided with eccentrics andconnecti ng-straps, whereby, by the simultaneous rotation of said shaftsin one and the same direction, said screenframes will be simultaneouslygyrated in relatively-opposite directions, substantially as and for thepurpose set forth.

4. As an improvement in mechanism for screening coal, two screen-holdingframes that re t upon and a pported y doubleeone ro le s. an are adaptedt have a gy t y mo n in a ho iz nta p an in omb driving-shafts, eachprovided with oppositelyarranged eccentrics, and the straps which con-'nect said eccentrics with said screen-frames, substantially as and forthe purpose specified. In timony hat e C a he foregoing we hav he un oet ou nd hi 2 ay of March, 1889.

ECKLEY B. COXE. SAMUEL SALMON.

Witnesses:

ELLIOTT A. OBERRENDER, HARRY J. DAVIS.

. 5 nation with two shafts that are journaled ver- 1

